Hailey Scott sits in her bedroom window in the granny flat built on the back of an old truck by her dad Rob. Photo: Jason South

More recently, Mr Scott has turned his hand to building homes on the back of old trucks. The timber-lined creations are built with sleeping lofts, pot-belly stoves, decks, kitchen benches and ample windows.

Mr Scott said he was inspired to build his own style of granny flat after looking into other people’s backyards and seeing what he describes as “toxic boxes” - stuffy rooms with fluorescent lights and aluminium windows.

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“I thought, 'I’ve got to make green granny flats',” he said.

At first, the 50-year-old started building the studios on the back of trucks for budget reasons, as a replacement for expensive steel bases. But there were other benefits, too. They could be towed or driven into position, and Mr Scott said there was something undeniably romantic about a house on wheels. "We must all have some gypsy blood in us,” he said.

“And they’re so nice to hang out in. They have a cosy feel. All our houses are so big these days.”

So far he has built five “Studio Trucks”, two of which were quickly occupied by his two teenage daughters. “As soon as I got the first one built, it was taken off me,” he said.

Another two trucks have been sold for about $25,000 each. Mr Scott said the vehicles were certainly not roadworthy, but on occasion he has organised a temporary vehicle permit to get them from place to place.

An entrepreneurial streak runs in the Scott family. Daughter Madelaine, 19, is raising $60,000 through crowdfunding website Pozible to expand the organic egg business she began when she was eight years old.

Mr Scott said he is hoping their next farm project will be maggot breeding for chicken feed.